From: Aleksa Sarai <cyphar@cyphar.com> To: Al Viro <viro@zeniv.linux.org.uk>, Jeff Layton <jlayton@kernel.org>, "J. Bruce Fields" <bfields@fieldses.org>, Arnd Bergmann <arnd@arndb.de>, David Howells <dhowells@redhat.com>, Shuah Khan <shuah@kernel.org>, Shuah Khan <skhan@linuxfoundation.org>, Ingo Molnar <mingo@redhat.com>, Peter Zijlstra <peterz@infradead.org>, Alexei Starovoitov <ast@kernel.org>, Daniel Borkmann <daniel@iogearbox.net>, Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>, Yonghong Song <yhs@fb.com>, Andrii Nakryiko <andriin@fb.com>, Jonathan Corbet <corbet@lwn.net> Cc: linux-ia64@vger.kernel.org, linux-doc@vger.kernel.org, Alexander Shishkin <alexander.shishkin@linux.intel.com>, Rasmus Villemoes <linux@rasmusvillemoes.dk>, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, sparclinux@vger.kernel.org, linux-api@vger.kernel.org, Jiri Olsa <jolsa@redhat.com>, linux-arch@vger.kernel.org, linux-s390@vger.kernel.org, Tycho Andersen <tycho@tycho.ws>, Aleksa Sarai <asarai@suse.de>, linux-sh@vger.kernel.org, David Drysdale <drysdale@google.com>, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, linux-xtensa@linux-xtensa.org, Kees Cook <keescook@chromium.org>, Jann Horn <jannh@google.com>, linuxppc-dev@lists.ozlabs.org, dev@opencontainers.org, Aleksa Sarai <cyphar@cyphar.com>, Andy Lutomirski <luto@kernel.org>, Namhyung Kim <namhyung@kernel.org>, Andrew Morton <akpm@linux-foundation.org>, Christian Brauner <christian@brauner.io>, libc-alpha@sourceware.org, linux-parisc@vger.kernel.org, linux-m68k@lists.linux-m68k.org, netdev@vger.kernel.org, Chanho Min <chanho.min@lge.com>, Oleg Nesterov <oleg@redhat.com>, Eric Biederman <ebiederm@xmission.com>, linux-alpha@vger.kernel.org, linux-fsdevel@vger.kernel.org, bpf@vger.kernel.org, Linus Torvalds <torvalds@linux-foundation.org>, containers@lists.linux-foundation.org Subject: [PATCH v17 02/13] nsfs: clean-up ns_get_path() signature to return int Date: Sun, 17 Nov 2019 12:17:02 +1100 [thread overview] Message-ID: <20191117011713.13032-3-cyphar@cyphar.com> (raw) In-Reply-To: <20191117011713.13032-1-cyphar@cyphar.com> ns_get_path() and ns_get_path_cb() only ever return either NULL or an ERR_PTR. It is far more idiomatic to simply return an integer, and it makes all of the callers of ns_get_path() more straightforward to read. Fixes: e149ed2b805f ("take the targets of /proc/*/ns/* symlinks to separate fs") Signed-off-by: Aleksa Sarai <cyphar@cyphar.com> --- fs/nsfs.c | 29 ++++++++++++++--------------- fs/proc/namespaces.c | 6 +++--- include/linux/proc_ns.h | 4 ++-- kernel/bpf/offload.c | 12 ++++++------ kernel/events/core.c | 2 +- 5 files changed, 26 insertions(+), 27 deletions(-) diff --git a/fs/nsfs.c b/fs/nsfs.c index a0431642c6b5..f3d2833c5781 100644 --- a/fs/nsfs.c +++ b/fs/nsfs.c @@ -52,7 +52,7 @@ static void nsfs_evict(struct inode *inode) ns->ops->put(ns); } -static void *__ns_get_path(struct path *path, struct ns_common *ns) +static int __ns_get_path(struct path *path, struct ns_common *ns) { struct vfsmount *mnt = nsfs_mnt; struct dentry *dentry; @@ -71,13 +71,13 @@ static void *__ns_get_path(struct path *path, struct ns_common *ns) got_it: path->mnt = mntget(mnt); path->dentry = dentry; - return NULL; + return 0; slow: rcu_read_unlock(); inode = new_inode_pseudo(mnt->mnt_sb); if (!inode) { ns->ops->put(ns); - return ERR_PTR(-ENOMEM); + return -ENOMEM; } inode->i_ino = ns->inum; inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode); @@ -89,7 +89,7 @@ static void *__ns_get_path(struct path *path, struct ns_common *ns) dentry = d_alloc_anon(mnt->mnt_sb); if (!dentry) { iput(inode); - return ERR_PTR(-ENOMEM); + return -ENOMEM; } d_instantiate(dentry, inode); dentry->d_fsdata = (void *)ns->ops; @@ -98,23 +98,22 @@ static void *__ns_get_path(struct path *path, struct ns_common *ns) d_delete(dentry); /* make sure ->d_prune() does nothing */ dput(dentry); cpu_relax(); - return ERR_PTR(-EAGAIN); + return -EAGAIN; } goto got_it; } -void *ns_get_path_cb(struct path *path, ns_get_path_helper_t *ns_get_cb, +int ns_get_path_cb(struct path *path, ns_get_path_helper_t *ns_get_cb, void *private_data) { - void *ret; + int ret; do { struct ns_common *ns = ns_get_cb(private_data); if (!ns) - return ERR_PTR(-ENOENT); - + return -ENOENT; ret = __ns_get_path(path, ns); - } while (ret == ERR_PTR(-EAGAIN)); + } while (ret == -EAGAIN); return ret; } @@ -131,7 +130,7 @@ static struct ns_common *ns_get_path_task(void *private_data) return args->ns_ops->get(args->task); } -void *ns_get_path(struct path *path, struct task_struct *task, +int ns_get_path(struct path *path, struct task_struct *task, const struct proc_ns_operations *ns_ops) { struct ns_get_path_task_args args = { @@ -147,7 +146,7 @@ int open_related_ns(struct ns_common *ns, { struct path path = {}; struct file *f; - void *err; + int err; int fd; fd = get_unused_fd_flags(O_CLOEXEC); @@ -164,11 +163,11 @@ int open_related_ns(struct ns_common *ns, } err = __ns_get_path(&path, relative); - } while (err == ERR_PTR(-EAGAIN)); + } while (err == -EAGAIN); - if (IS_ERR(err)) { + if (err) { put_unused_fd(fd); - return PTR_ERR(err); + return err; } f = dentry_open(&path, O_RDONLY, current_cred()); diff --git a/fs/proc/namespaces.c b/fs/proc/namespaces.c index dd2b35f78b09..08dd94df1a66 100644 --- a/fs/proc/namespaces.c +++ b/fs/proc/namespaces.c @@ -42,14 +42,14 @@ static const char *proc_ns_get_link(struct dentry *dentry, const struct proc_ns_operations *ns_ops = PROC_I(inode)->ns_ops; struct task_struct *task; struct path ns_path; - void *error = ERR_PTR(-EACCES); + int error = -EACCES; if (!dentry) return ERR_PTR(-ECHILD); task = get_proc_task(inode); if (!task) - return error; + return ERR_PTR(-EACCES); if (ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS)) { error = ns_get_path(&ns_path, task, ns_ops); @@ -57,7 +57,7 @@ static const char *proc_ns_get_link(struct dentry *dentry, nd_jump_link(&ns_path); } put_task_struct(task); - return error; + return ERR_PTR(error); } static int proc_ns_readlink(struct dentry *dentry, char __user *buffer, int buflen) diff --git a/include/linux/proc_ns.h b/include/linux/proc_ns.h index d31cb6215905..aed366b4795c 100644 --- a/include/linux/proc_ns.h +++ b/include/linux/proc_ns.h @@ -76,10 +76,10 @@ static inline int ns_alloc_inum(struct ns_common *ns) extern struct file *proc_ns_fget(int fd); #define get_proc_ns(inode) ((struct ns_common *)(inode)->i_private) -extern void *ns_get_path(struct path *path, struct task_struct *task, +extern int ns_get_path(struct path *path, struct task_struct *task, const struct proc_ns_operations *ns_ops); typedef struct ns_common *ns_get_path_helper_t(void *); -extern void *ns_get_path_cb(struct path *path, ns_get_path_helper_t ns_get_cb, +extern int ns_get_path_cb(struct path *path, ns_get_path_helper_t ns_get_cb, void *private_data); extern int ns_get_name(char *buf, size_t size, struct task_struct *task, diff --git a/kernel/bpf/offload.c b/kernel/bpf/offload.c index ba635209ae9a..a2253a044f90 100644 --- a/kernel/bpf/offload.c +++ b/kernel/bpf/offload.c @@ -302,14 +302,14 @@ int bpf_prog_offload_info_fill(struct bpf_prog_info *info, struct inode *ns_inode; struct path ns_path; char __user *uinsns; - void *res; + int res; u32 ulen; res = ns_get_path_cb(&ns_path, bpf_prog_offload_info_fill_ns, &args); - if (IS_ERR(res)) { + if (res) { if (!info->ifindex) return -ENODEV; - return PTR_ERR(res); + return res; } down_read(&bpf_devs_lock); @@ -526,13 +526,13 @@ int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map) }; struct inode *ns_inode; struct path ns_path; - void *res; + int res; res = ns_get_path_cb(&ns_path, bpf_map_offload_info_fill_ns, &args); - if (IS_ERR(res)) { + if (res) { if (!info->ifindex) return -ENODEV; - return PTR_ERR(res); + return res; } ns_inode = ns_path.dentry->d_inode; diff --git a/kernel/events/core.c b/kernel/events/core.c index aec8dba2bea4..39c5711e868a 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -7258,7 +7258,7 @@ static void perf_fill_ns_link_info(struct perf_ns_link_info *ns_link_info, { struct path ns_path; struct inode *ns_inode; - void *error; + int error; error = ns_get_path(&ns_path, task, ns_ops); if (!error) { -- 2.24.0
WARNING: multiple messages have this Message-ID (diff)
From: Aleksa Sarai <cyphar@cyphar.com> To: Al Viro <viro@zeniv.linux.org.uk>, Jeff Layton <jlayton@kernel.org>, "J. Bruce Fields" <bfields@fieldses.org>, Arnd Bergmann <arnd@arndb.de>, David Howells <dhowells@redhat.com>, Shuah Khan <shuah@kernel.org>, Shuah Khan <skhan@linuxfoundation.org>, Ingo Molnar <mingo@redhat.com>, Peter Zijlstra <peterz@infradead.org>, Alexei Starovoitov <ast@kernel.org>, Daniel Borkmann <daniel@iogearbox.net>, Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>, Yonghong Song <yhs@fb.com>, Andrii Nakryiko <andriin@fb.com>, Jonathan Corbet <corbet@lwn.net> Cc: Aleksa Sarai <cyphar@cyphar.com>, Eric Biederman <ebiederm@xmission.com>, Andy Lutomirski <luto@kernel.org>, Andrew Morton <akpm@linux-foundation.org>, Kees Cook <keescook@chromium.org>, Jann Horn <jannh@google.com>, Tycho Andersen <tycho@tycho.ws>, David Drysdale <drysdale@google.com>, Chanho Min <chanho.min@lge.com>, Oleg Nesterov <oleg@redhat.com>, Rasmus Villemoes <linux@rasmusvillemoes.dk>, Alexander Shishkin <alexander.shishkin@linux.intel.com>, Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>, Christian Brauner <christian@brauner.io>, Aleksa Sarai <asarai@suse.de>, Linus Torvalds <torvalds@linux-foundation.org>, dev@opencontainers.org, containers@lists.linux-foundation.org, bpf@vger.kernel.org, netdev@vger.kernel.org, linux-alpha@vger.kernel.org, linux-api@vger.kernel.org, libc-alpha@sourceware.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, linux-xtensa@linux-xtensa.org, sparclinux@vger.kernel.org Subject: [PATCH v17 02/13] nsfs: clean-up ns_get_path() signature to return int Date: Sun, 17 Nov 2019 12:17:02 +1100 [thread overview] Message-ID: <20191117011713.13032-3-cyphar@cyphar.com> (raw) Message-ID: <20191117011702.Xw5B-Nxy-DResznJUJTt92rQhUn-cAWvLdQBbDTaKF0@z> (raw) In-Reply-To: <20191117011713.13032-1-cyphar@cyphar.com> ns_get_path() and ns_get_path_cb() only ever return either NULL or an ERR_PTR. It is far more idiomatic to simply return an integer, and it makes all of the callers of ns_get_path() more straightforward to read. Fixes: e149ed2b805f ("take the targets of /proc/*/ns/* symlinks to separate fs") Signed-off-by: Aleksa Sarai <cyphar@cyphar.com> --- fs/nsfs.c | 29 ++++++++++++++--------------- fs/proc/namespaces.c | 6 +++--- include/linux/proc_ns.h | 4 ++-- kernel/bpf/offload.c | 12 ++++++------ kernel/events/core.c | 2 +- 5 files changed, 26 insertions(+), 27 deletions(-) diff --git a/fs/nsfs.c b/fs/nsfs.c index a0431642c6b5..f3d2833c5781 100644 --- a/fs/nsfs.c +++ b/fs/nsfs.c @@ -52,7 +52,7 @@ static void nsfs_evict(struct inode *inode) ns->ops->put(ns); } -static void *__ns_get_path(struct path *path, struct ns_common *ns) +static int __ns_get_path(struct path *path, struct ns_common *ns) { struct vfsmount *mnt = nsfs_mnt; struct dentry *dentry; @@ -71,13 +71,13 @@ static void *__ns_get_path(struct path *path, struct ns_common *ns) got_it: path->mnt = mntget(mnt); path->dentry = dentry; - return NULL; + return 0; slow: rcu_read_unlock(); inode = new_inode_pseudo(mnt->mnt_sb); if (!inode) { ns->ops->put(ns); - return ERR_PTR(-ENOMEM); + return -ENOMEM; } inode->i_ino = ns->inum; inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode); @@ -89,7 +89,7 @@ static void *__ns_get_path(struct path *path, struct ns_common *ns) dentry = d_alloc_anon(mnt->mnt_sb); if (!dentry) { iput(inode); - return ERR_PTR(-ENOMEM); + return -ENOMEM; } d_instantiate(dentry, inode); dentry->d_fsdata = (void *)ns->ops; @@ -98,23 +98,22 @@ static void *__ns_get_path(struct path *path, struct ns_common *ns) d_delete(dentry); /* make sure ->d_prune() does nothing */ dput(dentry); cpu_relax(); - return ERR_PTR(-EAGAIN); + return -EAGAIN; } goto got_it; } -void *ns_get_path_cb(struct path *path, ns_get_path_helper_t *ns_get_cb, +int ns_get_path_cb(struct path *path, ns_get_path_helper_t *ns_get_cb, void *private_data) { - void *ret; + int ret; do { struct ns_common *ns = ns_get_cb(private_data); if (!ns) - return ERR_PTR(-ENOENT); - + return -ENOENT; ret = __ns_get_path(path, ns); - } while (ret == ERR_PTR(-EAGAIN)); + } while (ret == -EAGAIN); return ret; } @@ -131,7 +130,7 @@ static struct ns_common *ns_get_path_task(void *private_data) return args->ns_ops->get(args->task); } -void *ns_get_path(struct path *path, struct task_struct *task, +int ns_get_path(struct path *path, struct task_struct *task, const struct proc_ns_operations *ns_ops) { struct ns_get_path_task_args args = { @@ -147,7 +146,7 @@ int open_related_ns(struct ns_common *ns, { struct path path = {}; struct file *f; - void *err; + int err; int fd; fd = get_unused_fd_flags(O_CLOEXEC); @@ -164,11 +163,11 @@ int open_related_ns(struct ns_common *ns, } err = __ns_get_path(&path, relative); - } while (err == ERR_PTR(-EAGAIN)); + } while (err == -EAGAIN); - if (IS_ERR(err)) { + if (err) { put_unused_fd(fd); - return PTR_ERR(err); + return err; } f = dentry_open(&path, O_RDONLY, current_cred()); diff --git a/fs/proc/namespaces.c b/fs/proc/namespaces.c index dd2b35f78b09..08dd94df1a66 100644 --- a/fs/proc/namespaces.c +++ b/fs/proc/namespaces.c @@ -42,14 +42,14 @@ static const char *proc_ns_get_link(struct dentry *dentry, const struct proc_ns_operations *ns_ops = PROC_I(inode)->ns_ops; struct task_struct *task; struct path ns_path; - void *error = ERR_PTR(-EACCES); + int error = -EACCES; if (!dentry) return ERR_PTR(-ECHILD); task = get_proc_task(inode); if (!task) - return error; + return ERR_PTR(-EACCES); if (ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS)) { error = ns_get_path(&ns_path, task, ns_ops); @@ -57,7 +57,7 @@ static const char *proc_ns_get_link(struct dentry *dentry, nd_jump_link(&ns_path); } put_task_struct(task); - return error; + return ERR_PTR(error); } static int proc_ns_readlink(struct dentry *dentry, char __user *buffer, int buflen) diff --git a/include/linux/proc_ns.h b/include/linux/proc_ns.h index d31cb6215905..aed366b4795c 100644 --- a/include/linux/proc_ns.h +++ b/include/linux/proc_ns.h @@ -76,10 +76,10 @@ static inline int ns_alloc_inum(struct ns_common *ns) extern struct file *proc_ns_fget(int fd); #define get_proc_ns(inode) ((struct ns_common *)(inode)->i_private) -extern void *ns_get_path(struct path *path, struct task_struct *task, +extern int ns_get_path(struct path *path, struct task_struct *task, const struct proc_ns_operations *ns_ops); typedef struct ns_common *ns_get_path_helper_t(void *); -extern void *ns_get_path_cb(struct path *path, ns_get_path_helper_t ns_get_cb, +extern int ns_get_path_cb(struct path *path, ns_get_path_helper_t ns_get_cb, void *private_data); extern int ns_get_name(char *buf, size_t size, struct task_struct *task, diff --git a/kernel/bpf/offload.c b/kernel/bpf/offload.c index ba635209ae9a..a2253a044f90 100644 --- a/kernel/bpf/offload.c +++ b/kernel/bpf/offload.c @@ -302,14 +302,14 @@ int bpf_prog_offload_info_fill(struct bpf_prog_info *info, struct inode *ns_inode; struct path ns_path; char __user *uinsns; - void *res; + int res; u32 ulen; res = ns_get_path_cb(&ns_path, bpf_prog_offload_info_fill_ns, &args); - if (IS_ERR(res)) { + if (res) { if (!info->ifindex) return -ENODEV; - return PTR_ERR(res); + return res; } down_read(&bpf_devs_lock); @@ -526,13 +526,13 @@ int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map) }; struct inode *ns_inode; struct path ns_path; - void *res; + int res; res = ns_get_path_cb(&ns_path, bpf_map_offload_info_fill_ns, &args); - if (IS_ERR(res)) { + if (res) { if (!info->ifindex) return -ENODEV; - return PTR_ERR(res); + return res; } ns_inode = ns_path.dentry->d_inode; diff --git a/kernel/events/core.c b/kernel/events/core.c index aec8dba2bea4..39c5711e868a 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -7258,7 +7258,7 @@ static void perf_fill_ns_link_info(struct perf_ns_link_info *ns_link_info, { struct path ns_path; struct inode *ns_inode; - void *error; + int error; error = ns_get_path(&ns_path, task, ns_ops); if (!error) { -- 2.24.0
next prev parent reply other threads:[~2019-11-17 1:25 UTC|newest] Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-11-17 1:17 [PATCH v17 00/13] open: introduce openat2(2) syscall Aleksa Sarai 2019-11-17 1:17 ` Aleksa Sarai 2019-11-17 1:17 ` [PATCH v17 01/13] namei: only return -ECHILD from follow_dotdot_rcu() Aleksa Sarai 2019-11-17 1:17 ` Aleksa Sarai 2019-11-17 1:17 ` Aleksa Sarai [this message] 2019-11-17 1:17 ` [PATCH v17 02/13] nsfs: clean-up ns_get_path() signature to return int Aleksa Sarai 2019-11-17 1:17 ` [PATCH v17 03/13] namei: allow nd_jump_link() to produce errors Aleksa Sarai 2019-11-17 1:17 ` Aleksa Sarai 2019-11-17 1:17 ` [PATCH v17 04/13] namei: allow set_root() " Aleksa Sarai 2019-11-17 1:17 ` Aleksa Sarai 2019-11-17 1:17 ` [PATCH v17 05/13] namei: LOOKUP_NO_SYMLINKS: block symlink resolution Aleksa Sarai 2019-11-17 1:17 ` Aleksa Sarai 2019-11-17 1:17 ` [PATCH v17 06/13] namei: LOOKUP_NO_MAGICLINKS: block magic-link resolution Aleksa Sarai 2019-11-17 1:17 ` Aleksa Sarai 2019-11-17 1:17 ` [PATCH v17 07/13] namei: LOOKUP_NO_XDEV: block mountpoint crossing Aleksa Sarai 2019-11-17 1:17 ` Aleksa Sarai 2019-11-17 1:17 ` [PATCH v17 08/13] namei: LOOKUP_BENEATH: O_BENEATH-like scoped resolution Aleksa Sarai 2019-11-17 1:17 ` Aleksa Sarai 2019-11-25 0:26 ` Al Viro 2019-11-25 6:03 ` Aleksa Sarai 2019-11-17 1:17 ` [PATCH v17 09/13] namei: LOOKUP_IN_ROOT: chroot-like " Aleksa Sarai 2019-11-17 1:17 ` Aleksa Sarai 2019-11-17 1:17 ` [PATCH v17 10/13] namei: LOOKUP_{IN_ROOT, BENEATH}: permit limited ".." resolution Aleksa Sarai 2019-11-17 1:17 ` [PATCH v17 10/13] namei: LOOKUP_{IN_ROOT,BENEATH}: " Aleksa Sarai 2019-11-25 0:35 ` Al Viro 2019-11-25 13:21 ` Aleksa Sarai 2019-11-28 10:10 ` Aleksa Sarai 2019-11-17 1:17 ` [PATCH v17 11/13] open: introduce openat2(2) syscall Aleksa Sarai 2019-11-17 1:17 ` Aleksa Sarai 2019-11-25 0:37 ` Al Viro 2019-11-17 1:17 ` [PATCH v17 12/13] selftests: add openat2(2) selftests Aleksa Sarai 2019-11-17 1:17 ` Aleksa Sarai 2019-11-17 1:28 ` [PATCH v17 13/13] Documentation: path-lookup: include new LOOKUP flags Aleksa Sarai 2019-11-17 1:28 ` Aleksa Sarai 2019-11-25 0:39 ` [PATCH v17 00/13] open: introduce openat2(2) syscall Al Viro
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